Question

There are balls of three colours
i.e. red, yellow and black. The number of black balls is 6 more than the average number of balls of each colour. The number red balls is 20% less than the number of black balls, and 6 more than the number of yellow coloured balls. Find the number of yellow coloured balls.

A 12
B 14
C 16
D 18
E 20
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